Touch signal detection circuit and method, and touch device

Abstract

The present invention provides a touch signal detection circuit. The touch signal detection circuit includes: a processing unit, at least one linear transmitting electrode, and at least two linear receiving electrodes; the transmitting electrode is perpendicular to the receiving electrode, the receiving electrode is perpendicular to a source driver line of a display screen, and each receiving electrode and each transmitting electrode form one node mutual capacitance; the processing unit acquires capacitance change values of at least two node mutual capacitances, and acquires a location of a touch signal according to the capacitance change values of the at least two node mutual capacitances.

What is claimed is: 
     
       1. A touch signal detection circuit, comprising:
 a processor, 
 at least one linear transmitting electrode, and 
 at least two linear receiving electrodes; 
 wherein the at least one linear transmitting electrode is perpendicular to the at least two linear receiving electrodes, the at least two linear receiving electrodes are perpendicular to a source driver line of a display screen, and each receiving electrode and each transmitting electrode form one node mutual capacitance; and 
 wherein the processor is configured to:
 acquire capacitance change values of at least two node mutual capacitances, 
 divide the capacitance change values into two groups according to a numerical range of the capacitance change values, 
 use one of the capacitive change values or an average value of the capacitance change values in one group that comprises a larger number of capacitance change values as an interference value, 
 obtain a data value by subtracting the interference value from each of the capacitance change values, and 
 use a location, at which the data value is greater than a preset value, of a node mutual capacitance as a location of a touch signal. 
 
 
     
     
       2. The touch signal detection circuit according to  claim 1 , wherein the display screen comprises a liquid crystal display (LCD). 
     
     
       3. A touch device, comprising:
 a display screen; and 
 a touch signal detection circuit that includes a processing unit, at least one linear transmitting electrode, and at least two linear receiving electrodes, 
 wherein the at least one linear transmitting electrode is perpendicular to the at least two linear receiving electrodes, the at least two linear receiving electrodes are perpendicular to a source driver line of the display screen, and each receiving electrode and each transmitting electrode form one node mutual capacitance; and 
 wherein the processing unit is configured to:
 acquire capacitance change values of at least two node mutual capacitances, 
 divide the capacitance change values into two groups according to a numerical range of the capacitance change values, 
 use one of the capacitive change values or an average value of the capacitance change values in one group that comprises a larger number of capacitance change values as an interference value, 
 obtain a data value by subtracting the interference value from each of the capacitance change values, and 
 use a location, at which the data value is greater than a preset value, of a node mutual capacitance as a location of a touch signal. 
 
 
     
     
       4. The touch device according to  claim 3 , wherein the display screen comprises a liquid crystal display (LCD). 
     
     
       5. A touch signal detection method, comprising:
 acquiring capacitance change values of at least two node mutual capacitances, wherein the at least two node mutual capacitances are formed by at least two linear receiving electrodes and at least one linear transmitting electrode, the at least one linear transmitting electrode is perpendicular to the at least two linear receiving electrodes, the at least two linear receiving electrodes are perpendicular to a source driver line of a display screen, and each receiving electrode and each transmitting electrode form one node mutual capacitance; 
 acquiring a location of a touch signal according to the capacitance change values of the at least two node mutual capacitances, wherein acquiring the location of the touch signal comprises:
 determining an interference value according to the capacitance change values of the at least two node mutual capacitances; and 
 determining the location of the touch signal according to the interference value and the capacitance change values, 
 
 wherein determining the interference value comprises: dividing the capacitance change values into two groups according to a numerical range of the capacitance change values, and using one of the capacitive change values or an average value of the capacitance change values in one group that comprises a larger number of capacitance change values as the interference value; and 
 wherein determining the location of the touch signal comprises: obtaining a data value by subtracting the interference value from each of the capacitance change values; and, using a location, at which the data value is greater than a preset value, of a node mutual capacitance as the location of the touch signal. 
 
     
     
       6. The touch signal detection method according to  claim 5 , wherein the display screen comprises a liquid crystal display (LCD).